I've noticed something odd about the dictionary. As an example: try searching for:
不 bu4 - not
It doesn't matter whether you search by only the english, pinyin, character, or english+pinyin, or english+character. You get a list of all the dependents of 不, but not 不 itself!
I've also come across words in the past where searching by alternative english meaning does not yield the character you're looking for, but using both english and pinyin does. For example, if you search for 木 using "wood", you find all its dependents, but 木 itself only appears if you add "mu4" to the serach.
This is also a problem when it comes to adding parent characters for words. So for the above example, I was unable to add 不 as a parent for 坏.
Other words which aren't appearing in the dictionary search:
(I know these were added quite recently, so that might explain why, but 不 must have been one of the first batch of words uploaded ever, I don't know why that wouldn't show up)
Pretty sure there are more, and I suspect this issue may not be limited to only mandarin.
Also: unticking/ticking the "Moderated items only" box doesn't seem to do yield any further results either.